Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 d28f8d5335c9676b…

MALICIOUS

Office (OLE) / .XLSX

187.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-03-08
MD5: 8c5e9f19643b87b2116932f943ceca6d SHA-1: 78ae29756563abf16c3f1201cf99db77df43ee57 SHA-256: d28f8d5335c9676b1af65c61283b1a1babd8f076f1dfc2e918b2af9ea97b0919
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 PowerShell

The critical heuristic firing indicates the presence of a payload for CVE-2017-11882 within an Equation Editor OLE object. This vulnerability allows for arbitrary code execution when the document is opened. The VBA macros themselves do not contain executable statements, suggesting the exploit payload is directly embedded within the OLE object.

Heuristics 3

  • Equation Editor Ole10Native payload — CVE-2017-11882 critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    An embedded Microsoft Equation 3.0 object (CLSID 0002CE02-0000-0000-C000-000000000046) carries an Ole10Native packager stream instead of the normal Equation Native/MTEF data. This is the weaponized Equation Editor RCE delivery shape used by CVE-2017-11882 / CVE-2018-0802 maldocs. The payload (font-record overflow + shellcode) is frequently encrypted and the stream name case-scrambled to evade scanners, but an Equation object holding an Ole10Native stream has no benign use.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Contains Equation Editor object — related to CVE-2017-11882 / CVE-2018-0802 exploitation, but CLSID presence alone is not the malformed MTEF exploit primitive.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
9a87f229da56843f245054a77b958840d540a7e45ba6b8fc5011122dcc655b55		 ole-package OLE Ole10Native stream: MBD0009DC55/Ole10naTIVe 1351 bytes

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